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Michael Chapman
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David A. Wheeler has written a nicely detailed account of the recent Shellshock vulnerability. It's astonishing to think it had been lurking around since 1989.

http://www.dwheeler.com/essays/shellshock.html
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Another on in the theme of "great low-level software hacks".

This sentence is the best:
  The sax instruction is a mix of sta and stx; it tries to write the contents of both A and X to memory, and due to the NMOS process used to manufacture the 6502, zeroes are stronger than ones, so bus contentions resolve into bitwise-and operations.

Relying on the processor manufacturing method to create custom op codes and then exploit them in very useful ways is amazing stuff.
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So, uh...  I have a confession to make.

I may have rewritten Protocol Buffers.

Again.

And it's infinity times faster.
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+Lennart Poettering's talk about the systemd Journal, from devconf.cz. Starting at 28:40 Lennart demos practically how useful "journalctl" can be in an administrator's day-to-day work. Enjoy!
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